Developing apparatus



Junez9, 1931. w, H, JAEGER 1,89,705

DEVELOPING APPARATUS Filed Jan. 5. 1929 Patented June 9, 1931 UNITEDSTATES' iai'rlzla'rv OFFICE WILLIAM H. JAEGER, OF TRENTON', NEW JERSEYDEVELOPING .APPARATUS Application med January 5, 1929. Serial No.336,665.

construction and inthe combination and ar` rangement of the severalparts of my imn proved developing apparatus whereby certain importantadvantages are attained and the device rendered simpler, less expensiveand otherwise more convenient and advanta eous for use, as will behereinafter more 29 fu ly set forth.

The novel features of my invention will hereinafter be definitelyclaimed.

Tn order that m invention may be the better understood, lywill nowproceed to describe the same with reference to the accomy panyingdrawings, wherein Figure l is a vertical longitudinal sectional Viewtaken through an apparatus constructed in accordance with an embodimentof myinvention;

Figure 2 is a-sectional view takensubstantially on the line 2-2 of Fiure l; Figure 3 is an enlarged ragmentary view illustrating one of thecarrying rollers and the trackway associated therewith;

Figure 4 is a fragmentary view in top plan of the roller at the deliveryend of the apparatus. 4

As herein disclosed, my improved apparatus comprises a tank T ofrequisite dimensions and which has its lower portion divided at acedpoints lengthwise thereof by the partltions l into the chambers 2, 3, 4,5, 6, 7, 8 and 9. The chambers 3, 5, 7 and 9 are ada ted to containwater. f. l

T e chamber 2 is to contain a supply of developer the chamber 4 a suplyl of bleach, the chamber 6 a supply of clear, and the chamber 8 asupply of redeveloper.

The developer solution preferably comprises the following admixturediluted to 160voz.: l

Oz. Hydroquinone 4 Sulphite of soda (anhy.) '8 yBoric acid (HaBos) lBromide of pota-ssium 1/2 Caustic soda (sticks) 4 This developersolution is used full strength and at a temperature ranging from and F.,the time of development being approximately forty-ve seconds.

The bleach comprises a solution diluted to oz. of

o Potassium bichromate 1.25 Sulphuric acid 2. 0

This solution is also used full strength at a temperature between 60 and75 F.

The clear comprises an admixture of Sodium sulphite (anhy.) 1

This is used full strength at a temperature between 60 and 75 F.

Thev redeveloper comprises the following ingredients diluted to 160 oz.:

Oz. Hydroquinone 4 Sulphite of soda (anhy.) 8 Boric'acid 1 Bromide ofpotassium 1/2 Caustic soda 4 This redeveloper is to be used fullstrength ggd 1also at a temperature between 60 and The partitions 1terminate a desired distance below the top of the tank T and support theparallel members 10 which provide mountings for the shafts 11 which arefurther supported by the side walls of the tank c The discs 12 of therollers C associated with the chambers 3, 5, 7 and 9 are hereindisclosed as of a diameter smaller than that of the discs 12 of theremaining rollers, but all of the discs are caused to rotate at the sameperipheral speed by a worm drive connection' curved film guide 20conforming to the adjacent portion of said disc 12 and which is arrangedoutwardly of the teeth 15. Interposed between adjacent longitudinallyspaced discs 12 and bridging the space therebetween are theupwardlycurved guide members 21 also carried by a member 10. With the variousrollers C in operation a film to be treated is operatively engaged withthe first roller C and the same will be carried through the upperportion of the developer chamber 2 and said film will be effectivelymaintained in requisite engagement with said roller by the associatedguides 20, the position or location of such guides 20 leaving theintermediate or exposed portion of the film free of Contact. This istrue in connection with all of the rollers, and as the film passes up- Pwardly with one roller it is caused to have proper engagement with theadjacent roller of the intermediate guide members 21. When the filmreaches the roller at the discharge end of the tank, the film isprevented i from passing around such roller by the guide fork 22 carriedby each of the members 10 and having close contact with the periphery ofa disc 12 at opposite sides of the teeth 15 thereof. l

My improved tank is especially adapted for use in connection with directpositive print paper and the speed of travel of the film through thetank is such to have the requisite development completed when the filmis discharged therefrom.

It is believed to be obvious that the water within the chambers 3, 5, 7-and 9 serves to wash the film after each separate treatment incident toits development.

From the foregoing description it is thought to be obvious that adeveloping apparatus constructed in accordance with my without departingfrom the principles and V spirit thereof and for this reason I do notwish to be understood as limiting myself to 'the precise arrangement andformation of the several parts-herein shown in carrying out my inventionin practice except4 as hereinafter claimed.

I claim 1. A tank for the development of direct positive rint paperdivided into a plurality of chambers, each containing a liquid incidentto the development of the paper, spaced discs rotatably supported aboveeach of the chambers and extending downwardly thereinto, means fordriving said discs at the same peripheral speeds, guides associated withthe lower portions of the discs to maintain the paper in roper ositionwith respect to the discs, said discs aving outstanding teeth forengagement wit-h perforations in the paper, the guides being positionedoutwardly o the teeth and engaging the marginal portions of said aper.

2. A tank for t e development of direct positive print paper dividedinto a plurality of chambers, each containing a liquid incident` to thedevelopment of the paper, spaced discs rotatably supported above each ofthe chambers and extending downwardly thereinto,

means for driving said discs at the same peripheral speeds, guidesassociated with the lower ortions of the discs to maintain the paper 1nproperposition with respect to the discs, said discs having outstandingteeth for engagement -with lperforations in the aper, the guides beingpositioned outwardly of the teeth whereby to engage the mar inalportions of the paper, and guides bri ging the space between adjacentdiscs to cause the paper to properly pass from one disc to another.

3. A tank for the development of direct positive rint paper divided intoa plurality' of cham ers, each containing a liquid incident to thedevelopment of the paper, spaced discs rotatably supported above each ofthe chambers and extending downwardly thereinto, means for drivin saiddiscs at the same peripheral speeds, gui es associated with the lowerportions of the discs to maintain the paper 1n proper position withrespect to the discs, said discs havin outstanding teeth for engagementwith per orations in the paper,- the guides being positioned outwardlyof the teeth whereby to enga e the marginal portions of the aper, an afork coacting with each of the iscs at the discharge end of the tank toprevent the film continuing around said disc, each of said forksstraddling the .t th f h invention 1s particularly well adapted for use.ee o t e assoclated dlsc v. by reason of the convenience and facilitywith In testimony whereof I hereunto affix my signature.

WILLIAM H. JAEGER.

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